简介：ＣｒｏｕｎｄｖｅｒｔｉｃａｌｄｅｆｏｒｍａｔｉｏｎｉｎｅａｒｔｈｑｕａｋｅｏｆＧｏｎｇｈｅ，ＱｉｎｇｈａｉＰｒｏｖｉｎｃｅＳｈｏｕ－ＷｅｎＧＯＮＧ（巩守文）ａｎｄＦｅｎｇ－ＹｉｎｇＧＵＯ（郭逢英）（ＳｅｃｏｎｄＣｒｕｓｔａｌＤｅｆｏｒｍａｔｉｏｎＭｏ...

简介：许多研究集中了于水平地面运动，当忽视从垂直地面motion.However产生的相关问题时，导致为水平地面运动的许多连贯功能，地震事件证明了地面的垂直部件打手势有时管理structures.In的最终的失败这份报纸，空间地面运动的一个垂直连贯功能模型基于Hao模型被建议并且疼痛模型的1个数组记录，和有效性被表明

简介：Seismicsafetyassessmentofgravitydamshasbecomeamajorconcerninmanyregionsoftheworldwhiletheeffectsofverticalseismicaccelerationsontheresponseofstructuresremainpoorlyunderstood.Thispaperfirstinvestigatestheeffectofincludingverticalaccelerationsintheslidingresponseanalysisofgravitydamssubjectedtoarangeofhistoricalgroundmotionrecordsseparatedintwogroupsaccordingtotheirsource-to-sitedistance.Analysesshowedthattheincidenceofverticalaccelerationsontheslidingresponseofgravitydamsissignificantlyhigherfornear-sourcerecordsthanforfarsourcerecords.Thepseudo-static30%loadcombinationrule,commonlyusedinpracticetoaccountforthenon-simultaneousoccurrenceofthepeakhorizontalandverticalaccelerations,yieldedgoodapproximationsoftheminimumsafetyfactorsagainstslidingcomputedfromtime-historyanalyses.Amethodforempiricallyestimatingtheverticalresponsespectrabasedonhorizontalspectra,accountingforthedifferenceinfrequencycontentandamplitudesbetweenthetwocomponentsisinvestigated.Resultsfromanalysesusingspectrumcompatiblehorizontalandverticalsyntheticrecordsalsoapproximatedwelltheslidingresponseofagravitydamsubjectedtoseriesofsimultaneoushorizontalandverticalhistoricalearthquakerecords.

简介：Theconventionalpseudo-staticapproachoftenneglectstheeffectoftheverticalseismicaccelerationonthestabilityofaslope,butsomeanalysesunderplane-strain(2D)conditionsshowasignificanteffectontheslopestability.Thepurposeofthisstudyistoinvestigatetheeffectoftheverticalaccelerationonthesafetyofthree-dimensional(3D)slopes.Inthestrictframeworkoflimitanalysis,a3Dkinematicallyadmissiblerotationalfailuremechanismisadoptedherefor3Dhomogeneousslopesinfrictional/cohesivesoils.Asetofstabilitychartsispresentedinawiderangeofparametersfor3Dslopesundercombinedhorizontalandverticalseismicloadingconditions.Accountingfortheeffectsoftheverticalseismicacceleration,thedifferenceinsafetyfactorsfor3Dslopescanexceed10%,whichwillsignificantlyoverestimatethesafetyofthe3Dslopes.

简介：Theverticaldeformationgradientcanreflecttherateofverticalchangeinunitdistance,andtheverticaldeformationvelocitygradientcanreflectthestrengthoftheearth'scrusttectonicactivities.Inthispaper,usinglongperiodlevelingdatacombinedwithGPSdata,theverticaldeformationgradientvaluesarecalculated.LevelingdataandGPSdataaretwodifferentmeansofmonitoringdeformation,buttheresultisapproximatelythesameverticaldeformationgradient.Theresultsshowthatthespatialdistributionoftheverticaldeformationvelocitygradientandtectonicdistributionhasanobviouscorrelation.ThemostsignificantgradientanomaliesalongtheNorth-SouthSeismicBeltareXianshuihefault,LongmenshanfaultandXiaojiang-Zemuhefault,whilethesecondgradientanomaliesinthenortheasternQinghai-TibetanplateauareZhuanglanghefaultandLenglonglingfault.TheMenyuanM_S6.4earthquakein2016occurredinthisabnormalarea.However,accordingtotheverticaldeformationhighgradientareadistribution,thereisalsothepossibilityofanearthquakeoccurrenceintheTianzhuandJingtaiarea.TheareaofconvergenceofthreemajorfaultzonesisthestrongesttectonicallyactiveregionoftheNorth-SouthSeismicBelt.

简介：Basedontheloadmodelofauniformisotropicsemi-infiniteelasticmedium,wededucedacalculationofverticaldisplacementandtiltandproposedamethodofcalculationofverticaldisplacementsandtiltscausedbyirregularloadonthegroundorundergroundatacertainpointwithtwo-dimensionalandthree-dimensionalshapes.Wecomparedthedifferencebetweenthesimplifiedmodelandtheirregularmodel.Finally,theverticaldisplacementsneartheirregularloadandthedistributionofhorizontaltiltarepresented.Theresultsshowthat,comparedwiththepointsimplifiedmodel,theirregularloadmodelhascertainadvantagesfordescribingthenearfield.Theestablishmentofatwodimensionalirregularloadmodelcanhelpwiththecalculationofthemodalvectorsuperpositionafterloadscattering.Thethree-dimensionalirregularloadmodelcanredistributeloadthroughdifferentweightsgiventothescatteredpointsaftertheloadscattering,andthenobtaindisplacementwiththevectorcalculationmethod.Theresultsofvectorsuperpositioncalculationfromthescatteredirregularloadbothintwo-dimensionsandthree-dimensionsareallconvergentobviouslyasgridsbecomedenser,anditisshownthatthecalculationmethodiscorrectandfeasible.

简介：Inthispaper,weusethedailyrangesoftheverticalmagneticintensityofapproximately76geomagneticstationsfromJanuary1,2008toDecember31,2010toanalyzethespatialandtemporalcharacteristicsofZranges.Theresultsaresummarizedasfollows:(1)Temporally,weuseregressiveanalysisandFFTanalysistoanalyzethedata.TheresultsshowthattheZcomponentdailyrangesofallstationshaveanobviouscyclicalvariation,thecomputedFourierspectraofalldatasetshaveclearlyresolvedtherequiredperiodicitiesinthedata,intheformofdistinctpeaksatdays365,183,22,and73,andthepowerspectraofday365isthehighestinallperiods.(2)Intermsofspatialvariation,thedailyrangesshownonlinearvariationwithlatitudeinChina.Theresultsshowtheexistenceofapointofinflexion(maximalvaluepoint)nearbyatabout25°N,thedailyrangesofZrisefrom15°~25°Nandhaveagoodlineardecreasevariationalongwith25°~50°N.(3)ComparedwiththespatialandtemporalvariationsofZdailyrangeswiththeSqcurrentinversion,wefoundthatthespatialandtemporalcharacteristicsofZrangesaredecidedmainlybythespatio-temporalevolutionoftheSqcurrentsystem.(4)IfthelatitudesofthemaximumamplitudesofvariationoftheverticalcomponentinthegeomagneticquietdaysareroughlytakenasthelatitudescorrespondingtothefociofSqoverheadcurrentsystem,wecanseethattheselatitudesoffocibecomehigherinsummer,arelowestinwinterandhighestduringEquinoxes,displayingconspicuousmonthlyanddailyvariations.Fortwosuccessivegeomagneticquietdays,thelatitudesoffocimayvarytendegrees.

简介：隔离轴承和dampers经常在墩和上层建筑之间被安装在大地震下面减少桥的地震回答。这份报纸论述为桥更潮湿的新奇的钢。更潮湿作为精力驱散部件采用钢盘子，并且采用垂直免费机制完成一个大变丑能力。用用称为ABAQUS的一个有限元素节目的控制排水量的周期的装载和数字分析的伪静电干扰测试被进行调查行为更潮湿，并且设计方法论基于测试和数字分析被建议。从这研究获得的主要结论如下：(1)新dampers在大排水量下面有稳定的磁滞现象行为；(2)有限元素分析能模仿行为与令人满意的精确性更潮湿；并且(3)简化了设计方法论更潮湿是有效的。

简介：为了调查空增强的水泥(RC)的地震表演，在经常的轴的负担下面并且轮转地衔接矩形的生气的节的柱biaxial弯曲，五个标本被测试。参量的研究为不同轴的负担比率，纵的加强比率和侧面的加强比率被执行。试验性的结果证明在曲折失败模式和他们的最终的表演没有通过的所有测试标本被曲折能力统治，它被破裂/扣环代表张力纵在桥列的底部重新锁。Biaxial力量和排水量磁滞现象环严重地显示出重要僵硬和力量降级，和拧的效果和两个方向的联合相互作用效果减少结构的地震抵抗。然而，从3.5～5.7变化的测量韧性系数和从0.19和0.26变化的相等的粘滞的抑制比率能满足地震设计的要求。有在这研究的侧面的加强的配置的空RC矩形的桥列在双向地震刺激下面有优秀性能，并且可以为为高速公路桥(JTG/TB02-01-2008)的地震设计在指南描述的当前的空RC矩形的节配置被看作一个代用品。塑料绞链区域的长度被发现为所有标本列接近1:6空RC矩形的桥列高度，并且不到那些在当前的JTG/T指定了，多。因此，塑料绞链区域的长度是为RC矩形的空桥列集中的更多。

简介：SignificantanomalieswereobservedatthegeomagneticstationsinthesouthwestregionofChinabeforetheYingjiangMS6.1earthquakeandtheLudianMS6.5earthquakein2014.Weprocessedthegeomagneticverticalcomponentdiurnalvariationdatabythespatialcorrelationmethod.TheresultsshowthatduringtheperiodfromApril1toMay20,2014,thereexistedquasi-synchronousdecreasechangesinthecoefficientcurvesbetweenthefivegeomagneticstationsofGuiyang,Hechi,Nanshan,Muli,YongningandXinyiandHongshanstations.Furthermore,therewasahighgradientzoneinthenormalizedcorrelationcoefficientcontourmapwithbackgroundvaluesremoved.TheepicentersoftheYingjiangMS6.1earthquakeandtheLudianMS6.5earthquakearelocatedinthegradientzoneornearthegradientzone.

简介：ThedevastatingMS8.0WenchuanearthquakerupturedtwolargeparallelthrustfaultsalongthemiddlesegmentoftheLongmenshanthrustbelt.PreseismicandpostseismiclevelingdataindicatedthehangingwalloftheYingxiuBeichuan-NanbathrustfaultmainlypresentedcoseismicupliftwithrespecttothereferencepointatPingwucountytown,andtheobservedmaximumupliftof4.7mislocatedatBeichuancounty(Qushantown)whichisabout100mwestofthefaultscarp.ThefootwalloftheYingxiu-Beichuan-Nanbathrustfaultmainlyshowedsubsidencewithmaximumsubsidenceof0.6mneartherupture.Byemployingalistricdislocationmodel,wefoundthatthefaultgeometrymodelofexponentialdipangleδ=88°×[1-exp(-9/h)]withdepthof18kmanduniformthrust-slipof5.6mcouldfittheobservedcoseismicverticaldeformationverywell,whichverifiesthelistricthrustmodeloftheLongmenshanorogeniczone.